Please help answer this question below:

Three tables listed below show random variables and their probabilities. However, only one of these is actually a probability distribution. A c 1: par) 1: par) 5 0.1 5 0.1 10 0.7 10 0.7 15 0.1 15 0.1 20 0.3 20 0.1 a. Which is it? c. Compute the mean, variance, and standard deviation of this distribution. (Round the final answers to 2 decimal places.) 1 . Mean 1.: 2- variance 02 3. Standard deviation 0